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21-10-2019
Mathematics

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(3a +7)² – 5a(a-4) ..... Help

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Mirandawolfaj Mirandawolfaj

21-10-2019

Answer:

4a²+62a+49

Step-by-step explanation:

since (a+b)^2= a^2+2ab+b^2

(3a +7)² – 5a(a-4)

simplify the equation first

9a²+42a+49-5a²+20a

= 4a²+62a+49

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